It has been claimed that different mechanisms exist that regulate the timing and

Question

It has been claimed that different mechanisms exist that regulate the timing and coordination of behaviors in animals and plants.

a) Justify the claim by describing an example of a behavioral event in PLANTS that occurs in response to a 24-hour light/dark cycle.

b) Justify the claim by describing an example of a behavioral event in ANIMALS that occurs in response to a 24-hour light/dark cycle.

c) Justify the claim by describing an example of a behavioral event in PLANTS that occurs in response to a seasonal cycle.

d) Justify the claim by describing an example of a behavioral event in ANIMALS that occurs in response to a seasonal cycle.

Explanation / Answer

a. leaves of many plants are open during the day and are closed at night .Daily rhythms of such behaviours thus appear to be simple responses of living beings to cyclic presence/absence of environmental stimuli.For eg leaves of Mimosa Pudica.

b.Circadian rhythms can influence sleep-wake cycles, hormone release, body temperature and other important bodily functions. They have been linked to various sleep disorders, such as insomnia.

c.Plant responses to water regulation is a seasonal response.It changes its physioligy according to the presence or absence of water in different seasons.Ripening of fruit is another such example.

d.Tempaerature regulation in animals is a saesonal response which varies according to the temperture of the external surroundings.

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